XML 16 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2019
Jun. 14, 2019
Sep. 30, 2018
Document and Entity Information:      
Entity Registrant Name RIVERVIEW BANCORP INC    
Entity Central Index Key 0001041368    
Trading Symbol rvsb    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --03-31    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Common Stock, Shares Outstanding   22,622,712  
Entity Public Float     $ 199,772,614
Document Type 10-K    
Document Period End Date Mar. 31, 2019    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Title Of 12b Security Common Stock